First-quarter same-store sales may slip due to a voluntary halt in serving pork in a third of its U.S. restaurants.

Chipotle Mexican Grill voluntarily disrupted its pork supply amid concerns about humane conditions. We see potential modest risk for the first quarter.

According to various media reports, Chipotle (ticker: CMG) has stopped serving pork (carnitas) to about one-third of its nearly 1,800 restaurants across the U.S. The disruption was voluntary on the part...